1; RUN: opt -passes=dce -S %s -o - | FileCheck %s 2 3;; Check that DCE doesn't remove a dbg intrinsic that has an empty metadata 4;; operand. 5; CHECK: #dbg_declare(![[EMPTY:[0-9]+]], 6; CHECK: ![[EMPTY]] = !{} 7 8define dso_local void @fun() local_unnamed_addr #0 !dbg !9 { 9entry: 10 call void @llvm.dbg.declare(metadata !{}, metadata !13, metadata !DIExpression()), !dbg !15 11 ret void, !dbg !16 12} 13 14declare void @llvm.dbg.declare(metadata, metadata, metadata) 15 16!llvm.dbg.cu = !{!0} 17!llvm.module.flags = !{!2, !3, !4, !5, !6, !7} 18!llvm.ident = !{!8} 19 20!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 16.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None) 21!1 = !DIFile(filename: "test.c", directory: "/") 22!2 = !{i32 7, !"Dwarf Version", i32 5} 23!3 = !{i32 2, !"Debug Info Version", i32 3} 24!4 = !{i32 1, !"wchar_size", i32 4} 25!5 = !{i32 8, !"PIC Level", i32 2} 26!6 = !{i32 7, !"PIE Level", i32 2} 27!7 = !{i32 7, !"uwtable", i32 2} 28!8 = !{!"clang version 16.0.0"} 29!9 = distinct !DISubprogram(name: "fun", scope: !1, file: !1, line: 1, type: !10, scopeLine: 1, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !12) 30!10 = !DISubroutineType(types: !11) 31!11 = !{null} 32!12 = !{!13} 33!13 = !DILocalVariable(name: "a", scope: !9, file: !1, line: 1, type: !14) 34!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 35!15 = !DILocation(line: 1, column: 18, scope: !9) 36!16 = !DILocation(line: 1, column: 21, scope: !9) 37 38